# Mini-Quiz: Center of Mass and Tangential Gravitational Motion

by Ron Kurtus (revised 14 May 2011)

Take this Mini-Quiz to check your understanding of the lesson material.

1. What is the ratio of tangential speeds with respect to the CM?

It is sTM/sTm = M/m

It is vTm/vTM = M/m

It is sTm/sTM = M/m

2. What happens when you slightly increase the tangential velocity of a circular orbit?

The orbit becomes elliptical

The object will fly off into space in a radial direction

It becomes a larger circle

It negates the tangential motion

It can cause the object to move in a path toward or away from the CM

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

Move in the right direction

## Resources and references

Ron Kurtus' Credentials

### Websites

Center of Mass Calculator - Univ. of Tennessee - Knoxville (Java applet)

Center of Mass - Wikipedia

Gravitation Resources

### Books

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

## Students and researchers

www.school-for-champions.com/science/
mini-quiz_gravitation_center_of_mass_tangential_motion.htm

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